ASN Wikibase Occurrence # 149232
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| Date: | Wednesday 19 September 2012 |
| Time: | 10:45 |
| Type: |  Hiller UH-12B |
| Owner/operator: | Private |
| Registration: | N94735 |
| MSN: | 523 |
| Engine model: | Franklin 6A4200 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Kopperl, about 55 miles S of Fort Worth, TX -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Rio Vista, TX |
| Rio Vista, TX | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that he was on a survey flight when the helicopter engine suddenly stopped; he elected to autorotate to a field. The area he landed in had high vegetation, which “grabbed” the helicopter skids and the helicopter impacted the ground hard. Examination of the helicopter revealed that the main rotor impacted the tailboom during the accident and the tail rotor had separated from the helicopter. Examination of the engine revealed the No. 6 piston had disintegrated catastrophically, which caused additional internal damage to the engine.
Probable Cause: The catastrophic failure and disintegration of the No. 6 engine piston, which resulted in a total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=94735&x=0&y=0
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Sep-2012 23:57 | gerard57 | Added |
| 20-Sep-2012 03:52 | harro | Updated [Aircraft type, Location, Source, Narrative] |
| 20-Sep-2012 09:39 | Geno | Updated [Time, Registration, Cn, Phase, Nature, Source, Damage, Narrative] |
| 20-Sep-2012 13:28 | harro | Updated [Aircraft type, Location, Source, Narrative] |
| 20-Sep-2012 13:40 | harro | Updated [Aircraft type, Location, Source, Narrative] |
| 21-Sep-2012 06:30 | Geno | Updated [Registration, Cn, Source] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 13:23 | ASN Update Bot | Updated [Total occupants, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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